CN102570834B - The control circuit switched for the interval of power converter and method - Google Patents

The control circuit switched for the interval of power converter and method Download PDF

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Publication number
CN102570834B
CN102570834B CN201210026678.8A CN201210026678A CN102570834B CN 102570834 B CN102570834 B CN 102570834B CN 201210026678 A CN201210026678 A CN 201210026678A CN 102570834 B CN102570834 B CN 102570834B
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China
Prior art keywords
value
feedback signal
door
power converter
circuit
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CN102570834A (en
Inventor
杨大勇
黃伟轩
钟启晨
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Fairchild Taiwan Corp
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Fairchild Taiwan Corp
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Priority to US61/442,964 priority
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33515Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/0003Details of control, feedback or regulation circuits
    • H02M1/0032Control circuits allowing low power mode operation, e.g. in standby mode
    • H02M1/0035Control circuits allowing low power mode operation, e.g. in standby mode using burst mode control
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention provides a kind of control circuit that power converter interval is switched, comprise: adaptive circuit, produce adaptation door in response to a feedback signal relevant to the output loading of power converter; And commutation circuit, produce according to adaptation door and feedback signal and switch signal, the transformer of power converter is switched, with the output of regulating power transducer.

Description

The control circuit switched for the interval of power converter and method
Technical field
The present invention relates to a kind of power converter; Interval in particular to a kind of power converter switches.
Background technology
Switching power converter is extensive in order to provide regulation voltage and electric current to computer, household electrical appliances, communication apparatus ... etc.In recent years, the power saving problem of switching power converter receives very big concern.One prior art, denomination of invention is that the United States Patent (USP) 5,747,977 of " Switchingregulatorhavinglowpowermoderesponsivetoloadpowe rcomsumptions " discloses use one and fixes door to reach the technology of low-power consumption.But the shortcoming of this prior art is that the output of power converter has higher output ripple.This higher output ripple is that this door caused.
Summary of the invention
The object of the invention is to allow the output of power converter produce lower output ripple and to reach lower-wattage loss.
For achieving the above object, the invention provides a kind of control circuit that power converter interval is switched, comprise: adaptive circuit, adaptive circuit is responded the feedback signal associated with the output loading of the output of power converter and is produced and adapt to door; Commutation circuit, commutation circuit produces according to adaptation threshold value and feedback signal and switches signal, the transformer in this power converter is switched, with the output of regulating power transducer.
Aforesaid adaptive circuit generation has this adaptation door of the first value with the value in response to this feedback signal in the first scope, and generation has this adaptation door of the second value with the value in response to this feedback signal in the second scope, wherein there is this adaptation door of the first value lower than this adaptation door with the second value, and the value of this feedback signal in the first scope is higher than the value of this feedback signal in the second scope.
Aforementioned adaptive circuit comprises management circuit and current source.The adaptation door that aforementioned adaptive circuit produces is that the output of management circuit and current source formed.
For achieving the above object, the present invention also provides a kind of control method of power converter, comprises: the feedback signal that response associates with the output loading of an output of power converter produces and adapts to door; And produce a switching signal, to make the transformer of power converter be switched, with the output of regulating power transducer according to above-mentioned adaptation threshold value and feedback signal.
The aforementioned step producing adaptation door, comprises: produce the adaptation door with the first value, with the value in response to the feedback signal in the first scope.The aforementioned step producing adaptation door, comprises: produce the adaptation door with the second value, with the value in response to the feedback signal in the second scope.Wherein the aforementioned adaptation door with the first value is lower than this adaptation door with the second value, and the value of feedback signal in the first scope is higher than the value of the feedback signal in the second scope.
Aforementioned adaptation door produced by the adaptive circuit comprising management circuit and current source.Adaptation door is that the output totalling of management circuit and current source produced, and the adaptation door with the first value formed by the output of current source.
The present invention provides adaptation door when power converter interval switches, and reaches greater efficiency in underloading and idling.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that display the present invention is used in a power converter;
Fig. 2 is the circuit diagram of the preferred embodiment according to control circuit of the present invention;
Fig. 3 is the circuit diagram of the preferred embodiment according to management circuit in the present invention;
Fig. 4 is the circuit diagram of another preferred embodiment according to management circuit in the present invention;
Fig. 5 shows the oscillogram of switching signal when interval switches in the present invention.
[primary clustering symbol description]
Transformer 10
Control circuit 100
Transistor 20
Management circuit 200
Comparator 210
Switch 215
Current source 220
Buffer amplifier 250
Amplifier 260
Resistance 265
Transistor 270
Transistor 271
Transistor 272
Rectifier 30
Electric capacity 35
Resistance 40
Reference component 45
Optical coupler 50
The accurate shift transistor 60 in position
Resistance 61
Resistance 62
Draw high resistance 65
Current source 74
Switch 75
Oscillating circuit 80
Comparator 85
Flip-flop 90
Inverter 91
With door 92
Determine electric current I 1
Electric current I 2
Electric current I 270
First side winding N p
Secondary side winding N s
Pulse wave signal PLS
Switch signal S w
Tempus intercalare T bST
First feedback signal V a
Second feedback signal V b
Supply voltage V cC
Feedback signal V fB
Input voltage V iN
Output voltage V o
Slope signal V rMP
Door V t1
Door V t2
Embodiment
Fig. 1 is the circuit diagram that display the present invention is used in a power converter.Above-mentioned power converter comprises: control circuit 100, transformer 10, transistor 20, rectifier 30, electric capacity 35, one resistance 40, one reference component 45 and an optical coupler 50.Control circuit 100 is coupled to transistor 20 and controls transistor 20, to produce a switching signal S w.Transformer 10 comprises: first side winding N pand secondary side winding N s.Input voltage V iNbe provided to first side winding N pone end.Transistor 20 is connected serially to above-mentioned first side winding N pthe other end.Transistor 20 is used for switching above-mentioned transformer, is transformed into the output of power converter to make power supply energy from the input of power converter.Output voltage V oproduced through electric capacity 35.The output voltage V of power converter output obe conditioned by rectifier 30 and electric capacity 35.
Through resistance 40, reference component 45 and optical coupler 50, one feedback signal V fBaccording to output voltage V oproduced.According to a preferred embodiment of the present invention, reference component 45 can be realized by Zener diode.Control circuit 100 receives feedback signal V fBto form a feedback loop, switch signal S to produce wand the output voltage V of regulating power transducer o.
Fig. 2 is the circuit diagram of a preferred embodiment of control circuit 100 of the present invention.One one end of drawing high (pull-high) resistance 65 is connected to a supply voltage V cC.Feedback signal V fBbe supplied to the other end drawing high resistance 65.The gate terminal of accurate displacement (level-shift) transistor 60 receives feedback signal V fB.Supply voltage V cCseparately be supplied to the drain end of the accurate shift transistor 60 in position.The source terminal of the accurate shift transistor 60 in position produces one first feedback signal V a.Therefore, feedback signal V fBbe supplied to the gate terminal of the accurate shift transistor 60 in position, to produce the first feedback signal V a.In addition, the source terminal of the coupled one end of resistance 61 accurate shift transistor 60 to position.The other end of resistance 61 is connected to one end of resistance 62.The other end of resistance 62 is connected to ground.By resistance 61 with, 62 form attenuator.Above-mentioned attenuator will according to the first feedback signal V aproduce the second feedback signal V b, the second feedback signal V bresult from the junction of resistance 61 and 62.Therefore, the second feedback signal V bby the first feedback signal V athrough attenuator by produce.Above-mentioned attenuator is as voltage divider.First feedback signal V aand the second feedback signal V bbe associated with feedback signal V fB.
The positive input terminal of comparator 85 is coupled to the junction of resistance 61 and 62, to receive the second feedback signal V b.Second feedback signal V bbe supplied to comparator 85 and switch signal S to produce w.Oscillating circuit (OSC) 80 produces pulse wave signal PLS.The frequency input CK of flip-flop 90 receives pulse wave signal PLS to open (turnon) this flip-flop 90.Oscillating circuit 80 separately produces a slope signal V rMP.The negative input end of comparator 85 is coupled to oscillating circuit 80 and is used for receiving this oblique wave signal V rMP, with the second feedback signal V brelatively.The output of comparator 85 is coupled to the replacement end R of flip-flop 90, to close the output of (turnoff) flip-flop 90.The output Q of flip-flop 90 is connected to the first end with door 92, switches signal S to produce w.Receive pulse wave signal PLS with the second end of door 92 through inverter 91, switch signal S to limit wmaximum conducting (on-time) cycle (period).Supply voltage V cCseparately be supplied to the input D of flip-flop 90.
Adaptive circuit comprises: current source 74 and management circuit 200.Supply voltage V cCbe supplied to one end of current source 74.The other end of current source 74 is coupled to the output of management circuit 200.Certain electric current I 1produced by current source 74.The input of management circuit 200 is coupled to the source terminal of the accurate shift transistor 60 in position and one end of resistance 61, is used for reception first feedback signal V awith generation current I 2.In other words, electric current I 2according to this first feedback signal V aresult from the output of management circuit 200.In light condition, above-mentioned adaptation door can be determines electric current I 1.In more underloading or idling, aforesaid adaptation door can be determines electric current I 1and electric current I 2totalling.Therefore, adaptive circuit is according to the first feedback signal V aproduce one and adapt to door in the feedback loop of power converter.First feedback signal V abe associated with feedback signal V fB.Therefore, door is adapted in response to feedback signal V fBand adaptation ground (adaptively) is produced.Feedback signal V fBbe associated with output load and the output voltage V of power converter o.
One first end of switch 75 is coupled to the output of adaptive circuit to receive adaptation door.Second end of switch 75 is coupled to the positive input terminal of comparator 85 and the junction of resistance 61 and 62.The output of comparator 85 is coupled to the control end of switch 75 further, with control switch 75.Through this switch 75, comparator 85 is received in the second feedback signal V in feedback loop bcontain and adapt to the value of door.That is, when switch 75 is by the conducting of the output of comparator 85 institute, the value of the adaptation door on the input of switch 75 will be supplied to the second feedback signal VB of comparator 85 anode, and this adapts to threshold value system and is decided by electric current I 1, electric current I 2 and the resistance 61 and 62 of determining produced according to feedback.
Fig. 3 is the circuit diagram of a preferred embodiment of management circuit 200 in the present invention.Management circuit 200 comprises current source 220, switch 215 and a comparator 210.One end of current source 220 receives supply voltage V cC.The first end of switch 215 is coupled to the other end of current source 220.Second end of switch 215 is coupled to the first end of switch 75 and the other end of current source 74, to produce this electric current I 2.Switch 75 and current source 74 are shown in Fig. 2.The negative input end of comparator 210 is coupled to the source terminal of the accurate shift transistor 60 in position and the junction (as shown in Figure 2) of resistance 61, to receive the first feedback signal V a.One door V t1be supplied to the positive input terminal of comparator 210.The output of comparator 210 is coupled to the control end of switch 215, with control switch 215.In other words, comparator 210 is used for comparing the first feedback signal V aand door V t1.As the first feedback signal V avalue lower than this door V t1value, switch is that 215 unlatchings (turnon) are with generation current I 2.Electric current I 2thered is provided by this current source 220.On the other hand, as the first feedback signal V avalue higher than door V t1value, switch 215 is closed (turnoff) with forbidden energy electric current I 2.
With reference to figure 2, in light condition, as the first feedback signal V avalue higher than door V t1value time, there is the adaptation door of the first value by determining electric current I 1formed.In more underloading or idling, as this first feedback signal V avalue lower than door V t1value, there is the adaptation door of the second value by determining electric current I 1and electric current I 2totalling formed.In addition, there is the adaptation door of the first value (by determining electric current I 1formed) lower than there is the adaptation door of the second value (by determining electric current I 1and this electric current I 2totalling formed).Therefore, in light condition, adaptive circuit generation has the adaptation door of the first value to respond this first feedback signal V in one first scope avalue; In other words, as the first feedback signal V avalue when falling within the first above-mentioned scope, switch 215 cuts out, and the adaptation door with the first value is produced.In more underloading or idling, adaptive circuit produce there is the second value adaptation door (by determining electric current I 1and this electric current I 2totalling formed), to respond the first feedback signal V in the second scope avalue; In other words, as aforementioned first feedback signal V avalue when falling within the second scope, switch 215 is opened, and the adaptation door with the second value is produced.In addition, the first feedback signal V in the first scope is fallen into avalue higher than the first feedback signal V fallen in the second scope avalue.Due to the first feedback signal V abe associated with feedback signal V fB, adapt to door response feedback signal V fBadapt to ground produced, and produce with the load and the output voltage V that respond power converter output with adapting to door adaptation o.
Fig. 4 is the circuit diagram of another preferred embodiment of management circuit 200 in the present invention.The management circuit 200 of another preferred embodiment comprises: a voltage-to-current circuit and the current mirroring circuit formed by transistor 271 and 272.Voltage-to-current circuit then comprises: amplifier 260, buffer amplifier 250, resistance 265 and transistor 270.The positive input of amplifier 260 receives a door V t2.The output of amplifier 260 is coupled to the gate terminal of transistor 270, to control transistor 270.The drain end of transistor 270 is coupled to current mirroring circuit.The source terminal of transistor 270 is coupled to the negative input of amplifier 260 and one end of resistance 265.The other end of resistance 265 is coupled to the negative input of buffer amplifier 250 and the output of buffer amplifier 250.First feedback signal V abe supplied to the positive input of buffer amplifier 250.Therefore, the negative input of buffer amplifier 250 and the output of buffer amplifier 250 are coupled.As the first feedback signal V avalue lower than door V t2value time, voltage-to-current circuit generation current I 270.This electric current I 270can according to following equation I 270=[(V t2-V a)/R 265] produced.Due to door V t2for certain value, so electric current I 270can by the first feedback signal V adetermine.
Supply voltage V cCbe supplied to the source terminal of transistor 271 and 272.The gate terminal of transistor 271 and 272 is coupled.The drain end of transistor 271 is coupled to the drain end of transistor 270 and the gate terminal of transistor 271 and 272.The drain end of transistor 272 is coupled to first end and the current source I of switch 75 1the other end, with generation current I 2.Switch 75 and current source I 1be shown in Fig. 2.Therefore, by the current mirroring circuit that transistor 271 and 272 is formed, this electric current I is received 270to produce this electric current I 2in the drain end of transistor 272.In other words, due to electric current I 270be associated with this electric current I 2, as the first feedback signal V avalue lower than door V t2value time, electric current I 2produced.In other words, as the first feedback signal V avalue lower than door V t2value, management circuit 200 output current I 2.On the other hand, as the first feedback signal V avalue higher than door V t2value, management circuit 200 is output current I not 2.As previously mentioned, due to door V t2for certain value, electric current I 2respond the first feedback signal V avalue and produced.In other words, electric current I 2produced to respond feedback signal V fBvalue.In addition, the first feedback signal V avalue be associated with the load of power converter output; Because the first feedback signal V awith feedback signal V fBproportional, therefore feedback signal V fBalso the load of power converter output is associated with.
With reference to figure 2, in light condition, as the first feedback signal V avalue higher than door V t2value, there is the adaptation door of the first value by current source I 1formed.In more underloading or idling, as the first feedback signal V avalue lower than door V t2value, there is the adaptation door of the second value by current source I 1and electric current I 2totalling formed.In addition, there is this adaptation door of the first value lower than the adaptation door with the second value.Therefore, in light condition, adaptive circuit produces the adaptation door with the first value, to respond this first feedback signal V in one first scope avalue.In other words, as the first feedback signal V avalue when falling in aforesaid first scope, electric current I 2being disabled, there is this adaptation door of the first value (by determining electric current I 1formed) thus produced.In more underloading or idling, adaptive circuit produce there is the second value adaptation door to respond this first feedback signal V in one second scope avalue.In other words, as the first feedback signal V avalue when falling in the second scope, electric current I 2 is enabled, and has the adaptation door of the second value (by determining electric current I 1and this electric current I 2totalling formed) thus produced.In addition, the first feedback signal V in the first scope is fallen into ahigher than the first feedback signal V fallen in the second scope a.Namely the first feedback signal V athe first scope higher than the second scope.Due to the first feedback signal V abe associated with feedback signal V fB, adapt to door response feedback signal V fBadapt to ground produced, therefore adapt to door and produce with the load and the output voltage V that respond power converter output with adapting to o.
Fig. 5 switches the oscillogram of signal when interval switches in display the present invention.Switch signal S wresult from the gate terminal of transistor 20 to control transistor 20.In light condition, switch signal S wproduce a tempus intercalare T bSTto extend switching cycle and to shorten switching frequency, it is shown in Fig. 5.Interval that the present invention is power converter switches provides an adaptation door, reaches greater efficiency to make power converter when underloading.Therefore efficiency responds successively decreasing of switching and increasing progressively of switching cycle by being enhanced.Resting period T bSTby adapt to door value determine.

Claims (11)

1. the control circuit making power converter interval switch, is characterized in that, comprise:
One adaptive circuit, described adaptive circuit in response to a feedback signal relevant to an output loading of described power converter, to produce the adaptation door that is relevant to described feedback signal; And
One commutation circuit, described commutation circuit produces one according to the value of described adaptation door and described feedback signal and switches signal, a transformer of described power converter is switched, to regulate an output of this power converter;
Wherein said adaptation door is determined by the threshold value of one first feedback signal and certain value that are relevant to described feedback signal.
2. control circuit according to claim 1, it is characterized in that, described adaptive circuit generation has the described adaptation door of one first value with the value in response to the described feedback signal in one first scope, and generation has the described adaptation door of one second value with the value in response to the described feedback signal in one second scope.
3. control circuit according to claim 2, it is characterized in that, there is the described adaptation door of described first value lower than the described adaptation door with described second value, and the value of described feedback signal in described first scope is higher than the value of the described feedback signal in described second scope.
4. control circuit according to claim 1, is characterized in that, described adaptive circuit at least comprises a management circuit and a current source.
5. control circuit according to claim 4, is characterized in that, the described adaptation door that described adaptive circuit produces is the totalling of the output of described management circuit and described current source.
6. for a control method for power converter, it is characterized in that, comprise:
Respond the feedback signal associated with the output loading stating power converter, produce one and adapt to door; And
According to value and the described feedback signal generation one switching signal of described adaptation door, to switch a transformer of described power converter, regulate an output of this power converter;
Wherein said adaptation door is determined by the threshold value of one first feedback signal and certain value that are relevant to described feedback signal.
7. method according to claim 6, is characterized in that, produces the step of described adaptation door, comprises:
Generation has the described adaptation door of one first value with the value in response to the described feedback signal in one first scope.
8. method according to claim 7, wherein produces the step of described adaptation door, more comprises:
Generation has the described adaptation door of one second value with the value in response to the described feedback signal in one second scope.
9. method according to claim 8, it is characterized in that, there is the described adaptation door of described first value lower than the described adaptation door with described second value, and the value of described feedback signal in described first scope is higher than the value of the described feedback signal in described second scope.
10. method according to claim 6, is characterized in that, the value of described adaptation door produced by the adaptive circuit comprising a management circuit and a current source.
11. methods according to claim 6, the value of wherein said adaptation door adds up generation by the output of a management circuit and a current source.
CN201210026678.8A 2011-02-15 2012-02-07 The control circuit switched for the interval of power converter and method Active CN102570834B (en)

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US61/442,964 2011-02-15

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TWI465023B (en) * 2012-09-18 2014-12-11 Upi Semiconductor Corp Power converter and operating method thereof
US10203708B2 (en) * 2015-11-30 2019-02-12 Rohm Co., Ltd. Power regulator to control output voltage using feedback
CN107565937A (en) * 2017-08-25 2018-01-09 京东方科技集团股份有限公司 Power supply circuit and display device

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JP4127399B2 (en) * 2004-03-31 2008-07-30 松下電器産業株式会社 Switching power supply control semiconductor device
TWI348262B (en) * 2005-02-10 2011-09-01 Bruno Ferrario A circuit and method for adaptive frequency compensation for dc-to-dc converter
US8031492B2 (en) * 2007-06-14 2011-10-04 System General Corp. PWM controller for compensating a maximum output power of a power converter
KR100910460B1 (en) * 2007-07-03 2009-08-04 삼성전기주식회사 Oscillator having variable frequency
US7999527B2 (en) * 2008-02-07 2011-08-16 System General Corp. Switching controller having programmable feedback circuit for power converters
US9148060B2 (en) * 2008-03-03 2015-09-29 System General Corp. Switching controller with burst mode management circuit to reduce power loss and acoustic noise of power converter
US7903435B2 (en) * 2008-08-05 2011-03-08 System General Corp. Switching controller having switching frequency hopping for power converter
CN101552560B (en) * 2009-01-13 2011-06-22 成都芯源系统有限公司 Switch voltage-stabilizing circuit and control method thereof
US20100289474A1 (en) * 2009-05-13 2010-11-18 Ching-Chuan Kuo Controllers for controlling power converters

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TWI473404B (en) 2015-02-11
CN102570834A (en) 2012-07-11

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